A New Nation Votes: American Election Returns 1787-1825
From the webpage:
A New Nation Votes is a searchable collection of election returns from the earliest years of American democracy. The data were compiled by Philip Lampi. The American Antiquarian Society and Tufts University Digital Collections and Archives have mounted it online for you with funding from the National Endowment for the Humanities.
Currently there are 18040 elections that have been digitized.
Interesting data set and certainly one that could be supplemented with all manner of other materials.
Among other things, the impact or lack thereof from extension of the voting franchise would make an interesting study.
Enjoy!